所加的反应物可以是二烯烃 、 环二烯烃.The feed reactants can be alkadienes, cycloalkadienes.包含两个双键的化合物叫做二烯烃.Compounds containing two double bonds are called dienes.与二烯烃橡胶相比, EPDM的双键很少.Compared with diolefine rubber, EPDM has less double b...
Alas, it's not that simple.哎呀，事情不是那么简单的。Credit, like a looking-glass, broken once, is gone, alas!信誉像镜子，破碎无法补。Such farsightedness is, alas , only a drop in the bucket.可惜,这些远见只是杯水车薪.Long ago I had a heart, and sighed ...